(343 - 7) , (243 - 9) , (512 - 8) , (216 - 6)
Option:
Justification: In all other pairs, first number is the cube of the second.

(343 - 7) , (243 - 9) , (512 - 8) , (216 - 6)
Justification: In all other pairs, first number is the cube of the second.